Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o ERP W mais alto que possui um sinal de chamada de w255bi?
 ###Tabelas: CREATE TABLE political_assistants (political_assistants_id AUTO_INCREMENT PRIMARY KEY, Romanised name VARCHAR, Chinese name VARCHAR, age at appointment INT, Foreign nationality VARCHAR, Portfolio attachment VARCHAR, Prior occupation VARCHAR, Govt salary VARCHAR) CREATE TABLE translators (translators_id AUTO_INCREMENT PRIMARY KEY, Call sign VARCHAR, Frequency MHz INT, City of license VARCHAR, ERP W INT, Class VARCHAR, FCC info VARCHAR) CREATE TABLE reactors (reactors_id AUTO_INCREMENT PRIMARY KEY, KK - 1 VARCHAR, KK - 2 VARCHAR, KK - 3 VARCHAR, KK - 4 VARCHAR, KK - 5 VARCHAR, KK - 6 VARCHAR, KK - 7 VARCHAR) CREATE TABLE grand_slams:11_finals_9_titles_2_runner-ups (grand_slams:11_finals_9_titles_2_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponent VARCHAR, Score VARCHAR) CREATE TABLE legislation_sponsored_by_john_mccain (legislation_sponsored_by_john_mccain_id AUTO_INCREMENT PRIMARY KEY, Years covered VARCHAR, All bills sponsored INT, All amendments sponsored INT, All bills cosponsored INT, All amendments cosponsored INT, Bills originally cosponsored INT, Amendments originally cosponsored INT)  
SELECT MAX ERP W FROM translators WHERE Call sign = w255bi